OK6410矩阵键盘驱动 linux2.6.36
搞了好几天，终于在网络资料的帮助下，实现了4*4的矩阵键盘驱动，
参考文档：http://blog.csdn.net/xyl_nuaa/article/details/7047897 及相关网友评论
需要注明一点的是：
void samsung_keypad_cfg_gpio(unsigned int rows, unsigned int cols)函数的位置：
arch/arm/mach-s3c64xx/setup-keypad.c 修改方法如下：
voidsamsung_keypad_cfg_gpio(unsigned int rows, unsigned int cols)
{
unsignedint gpio;
unsignedint end;
/*Set all the necessary GPK pins to special-function 3: KP_ROW[x] */
end= S3C64XX_GPK(8 + rows);
for(gpio = S3C64XX_GPK(8); gpio < end; gpio++) {
s3c_gpio_cfgpin(gpio,S3C_GPIO_SFN(3));
s3c_gpio_setpull(gpio,S3C_GPIO_PULL_NONE);
}
/*Set all the necessary GPL pins to special-function 3: KP_COL[x] */
end= S3C64XX_GPL(0 + cols);
for(gpio = S3C64XX_GPL(0); gpio < end; gpio++) {
s3c_gpio_cfgpin(gpio,S3C_GPIO_SFN(3));
s3c_gpio_setpull(gpio,S3C_GPIO_PULL_NONE);
}
}
其中S3C_GPIO_PULL_NONE需要改成S3C_GPIO_PULL_UP
此外，还需要修改一点，代码原先为2*8的矩阵键盘，需修改为4*4的矩阵键盘
在arch/arm/mach-s3c64xx/mach-smdk6410.c中，在380行中修改为如下：
static struct samsung_keypad_platdata smdk6410_keypad_data _initdata={
.keymap_data = & smdk6410_keymap_data,
.rows = 4,
.cols = 4,
};
呵呵，整个代码如下：
samsung-keypad,c :
/* * Samsung keypad driver * * Copyright (C) 2010 Samsung Electronics Co.Ltd * Author: Joonyoung Shim <[email protected]> * Author: Donghwa Lee <[email protected]> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/init.h> #include <linux/input.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/sched.h> #include <plat/keypad.h> #define SAMSUNG_KEYIFCON 0x00 #define SAMSUNG_KEYIFSTSCLR 0x04 #define SAMSUNG_KEYIFCOL 0x08 #define SAMSUNG_KEYIFROW 0x0c #define SAMSUNG_KEYIFFC 0x10 /* SAMSUNG_KEYIFCON */ #define SAMSUNG_KEYIFCON_INT_F_EN (1 << 0) #define SAMSUNG_KEYIFCON_INT_R_EN (1 << 1) #define SAMSUNG_KEYIFCON_DF_EN (1 << 2) #define SAMSUNG_KEYIFCON_FC_EN (1 << 3) #define SAMSUNG_KEYIFCON_WAKEUPEN (1 << 4) /* SAMSUNG_KEYIFSTSCLR */ #define SAMSUNG_KEYIFSTSCLR_P_INT_MASK (0xff << 0) #define SAMSUNG_KEYIFSTSCLR_R_INT_MASK (0xff << 8) #define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET 8 #define S5PV210_KEYIFSTSCLR_P_INT_MASK (0x3fff << 0) #define S5PV210_KEYIFSTSCLR_R_INT_MASK (0x3fff << 16) #define S5PV210_KEYIFSTSCLR_R_INT_OFFSET 16 /* SAMSUNG_KEYIFCOL */ #define SAMSUNG_KEYIFCOL_MASK (0xff << 0) #define S5PV210_KEYIFCOLEN_MASK (0xff << 8) unsigned int keypad_keycode[] = {'1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G'}; /* SAMSUNG_KEYIFROW */ #define SAMSUNG_KEYIFROW_MASK (0xff << 0) #define S5PV210_KEYIFROW_MASK (0x3fff << 0) /* SAMSUNG_KEYIFFC */ #define SAMSUNG_KEYIFFC_MASK (0x3ff << 0) enum samsung_keypad_type { KEYPAD_TYPE_SAMSUNG, KEYPAD_TYPE_S5PV210, }; struct samsung_keypad { struct input_dev *input_dev; struct clk *clk; void __iomem *base; wait_queue_head_t wait; bool stopped; int irq; unsigned int row_shift; unsigned int rows; unsigned int cols; unsigned int row_state[SAMSUNG_MAX_COLS]; unsigned short keycodes[]; }; static int samsung_keypad_is_s5pv210(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); enum samsung_keypad_type type = platform_get_device_id(pdev)->driver_data; return type == KEYPAD_TYPE_S5PV210; } static void samsung_keypad_scan(struct samsung_keypad *keypad, unsigned int *row_state) { // struct device *dev = keypad->input_dev->dev.parent; unsigned int col; unsigned int val; // printk("<0>samsung_keypad_scan!\n"); for (col = 0; col < keypad->cols; col++) { /*if (samsung_keypad_is_s5pv210(dev)) { val = S5PV210_KEYIFCOLEN_MASK; val &= ~(1 << col) << 8; } else {*/ val = SAMSUNG_KEYIFCOL_MASK; val &= ~(1 << col); //} writel(val, keypad->base + SAMSUNG_KEYIFCOL); mdelay(1); val = readl(keypad->base + SAMSUNG_KEYIFROW); row_state[col] = ~val & ((1 << keypad->rows) - 1); } /* KEYIFCOL reg clear */ writel(0, keypad->base + SAMSUNG_KEYIFCOL); } static bool samsung_keypad_report(struct samsung_keypad *keypad, unsigned int *row_state) { struct input_dev *input_dev = keypad->input_dev; unsigned int changed; unsigned int pressed; unsigned int key_down = 0; unsigned int val; unsigned int col, row; for (col = 0; col < keypad->cols; col++) { changed = row_state[col] ^ keypad->row_state[col]; key_down |= row_state[col]; if (!changed) continue; for (row = 0; row < keypad->rows; row++) { if (!(changed & (1 << row))) continue; pressed = row_state[col] & (1 << row); printk("\n<0>samsung_keypad key %s,row:%d,col:%d\n" ,(pressed ? "pressed":"released"),row,col ); dev_dbg(&keypad->input_dev->dev, "key %s, row: %d, col: %d\n", pressed ? "pressed" : "released", row, col); val = MATRIX_SCAN_CODE(row, col, keypad->row_shift); input_event(input_dev, EV_MSC, MSC_SCAN, val); input_report_key(input_dev, keypad->keycodes[val], pressed); } input_sync(keypad->input_dev); } memcpy(keypad->row_state, row_state, sizeof(keypad->row_state)); return key_down; } static irqreturn_t samsung_keypad_irq(int irq, void *dev_id) { struct samsung_keypad *keypad = dev_id; unsigned int row_state[SAMSUNG_MAX_COLS]; unsigned int val; bool key_down; do { val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR); /* Clear interrupt. */ writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR); samsung_keypad_scan(keypad, row_state); key_down = samsung_keypad_report(keypad, row_state); if (key_down) wait_event_timeout(keypad->wait, keypad->stopped, msecs_to_jiffies(50)); } while (key_down && !keypad->stopped); return IRQ_HANDLED; } static void samsung_keypad_start(struct samsung_keypad *keypad) { unsigned int val; /* Tell IRQ thread that it may poll the device. */ keypad->stopped = false; clk_enable(keypad->clk); /* Enable interrupt bits. */ val = readl(keypad->base + SAMSUNG_KEYIFCON); val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN; writel(val, keypad->base + SAMSUNG_KEYIFCON); /* KEYIFCOL reg clear. */ writel(0, keypad->base + SAMSUNG_KEYIFCOL); } static void samsung_keypad_stop(struct samsung_keypad *keypad) { unsigned int val; /* Signal IRQ thread to stop polling and disable the handler. */ keypad->stopped = true; wake_up(&keypad->wait); disable_irq(keypad->irq); /* Clear interrupt. */ writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR); /* Disable interrupt bits. */ val = readl(keypad->base + SAMSUNG_KEYIFCON); val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN); writel(val, keypad->base + SAMSUNG_KEYIFCON); clk_disable(keypad->clk); /* * Now that chip should not generate interrupts we can safely * re-enable the handler. */ enable_irq(keypad->irq); } static int samsung_keypad_open(struct input_dev *input_dev) { printk("<0>samsung_keypad_open!\n"); struct samsung_keypad *keypad = input_get_drvdata(input_dev); samsung_keypad_start(keypad); return 0; } static void samsung_keypad_close(struct input_dev *input_dev) { struct samsung_keypad *keypad = input_get_drvdata(input_dev); samsung_keypad_stop(keypad); } static int __devinit samsung_keypad_probe(struct platform_device *pdev) { const struct samsung_keypad_platdata *pdata; const struct matrix_keymap_data *keymap_data; struct samsung_keypad *keypad; struct resource *res; struct input_dev *input_dev; unsigned int row_shift; unsigned int keymap_size; int error; unsigned int key=0; unsigned int keycodes_size=sizeof(keypad_keycode)/sizeof(keypad_keycode[0]); printk("<0>samsung_keypad_probe!\n"); pdata = pdev->dev.platform_data; if (!pdata) { dev_err(&pdev->dev, "no platform data defined\n"); return -EINVAL; } keymap_data = pdata->keymap_data; if (!keymap_data) { dev_err(&pdev->dev, "no keymap data defined\n"); return -EINVAL; } if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS) return -EINVAL; if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS) return -EINVAL; /* initialize the gpio */ if (pdata->cfg_gpio) pdata->cfg_gpio(pdata->rows, pdata->cols); row_shift = get_count_order(pdata->cols); keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]); keypad = kzalloc(sizeof(*keypad) + keymap_size, GFP_KERNEL); input_dev = input_allocate_device(); if (!keypad || !input_dev) { error = -ENOMEM; goto err_free_mem; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { error = -ENODEV; goto err_free_mem; } keypad->base = ioremap(res->start, resource_size(res)); if (!keypad->base) { error = -EBUSY; goto err_free_mem; } keypad->clk = clk_get(&pdev->dev, "keypad"); if (IS_ERR(keypad->clk)) { dev_err(&pdev->dev, "failed to get keypad clk\n"); error = PTR_ERR(keypad->clk); goto err_unmap_base; } keypad->input_dev = input_dev; keypad->row_shift = row_shift; keypad->rows = pdata->rows; keypad->cols = pdata->cols; init_waitqueue_head(&keypad->wait); input_dev->name = pdev->name; input_dev->id.bustype = BUS_HOST; input_dev->dev.parent = &pdev->dev; input_set_drvdata(input_dev, keypad); input_dev->open = samsung_keypad_open; input_dev->close = samsung_keypad_close; input_dev->evbit[0] = BIT_MASK(EV_KEY); if (!pdata->no_autorepeat) input_dev->evbit[0] |= BIT_MASK(EV_REP); input_set_capability(input_dev, EV_MSC, MSC_SCAN); input_dev->keycode = keypad->keycodes; input_dev->keycodesize = sizeof(keypad->keycodes[0]); input_dev->keycodemax = pdata->rows << row_shift; /*matrix_keypad_build_keymap(keymap_data, row_shift, input_dev->keycode, input_dev->keybit);*/ for(key=0;key<keycodes_size;key++){ int code=keypad->keycodes[key]=keypad_keycode[key]; if(code<=0) continue; __set_bit(code,input_dev->keybit); } __clear_bit(0,input_dev->keybit); keypad->irq = platform_get_irq(pdev, 0); if (keypad->irq < 0) { error = keypad->irq; goto err_put_clk; } error = request_threaded_irq(keypad->irq, NULL, samsung_keypad_irq, IRQF_ONESHOT, dev_name(&pdev->dev), keypad); if (error) { dev_err(&pdev->dev, "failed to register keypad interrupt\n"); goto err_put_clk; } error = input_register_device(keypad->input_dev); if (error) goto err_free_irq; device_init_wakeup(&pdev->dev, pdata->wakeup); platform_set_drvdata(pdev, keypad); return 0; err_free_irq: free_irq(keypad->irq, keypad); err_put_clk: clk_put(keypad->clk); err_unmap_base: iounmap(keypad->base); err_free_mem: input_free_device(input_dev); kfree(keypad); return error; } static int __devexit samsung_keypad_remove(struct platform_device *pdev) { struct samsung_keypad *keypad = platform_get_drvdata(pdev); device_init_wakeup(&pdev->dev, 0); platform_set_drvdata(pdev, NULL); input_unregister_device(keypad->input_dev); /* * It is safe to free IRQ after unregistering device because * samsung_keypad_close will shut off interrupts. */ free_irq(keypad->irq, keypad); clk_put(keypad->clk); iounmap(keypad->base); kfree(keypad); return 0; } #ifdef CONFIG_PM static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad, bool enable) { struct device *dev = keypad->input_dev->dev.parent; unsigned int val; clk_enable(keypad->clk); val = readl(keypad->base + SAMSUNG_KEYIFCON); if (enable) { val |= SAMSUNG_KEYIFCON_WAKEUPEN; if (device_may_wakeup(dev)) enable_irq_wake(keypad->irq); } else { val &= ~SAMSUNG_KEYIFCON_WAKEUPEN; if (device_may_wakeup(dev)) disable_irq_wake(keypad->irq); } writel(val, keypad->base + SAMSUNG_KEYIFCON); clk_disable(keypad->clk); } static int samsung_keypad_suspend(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct samsung_keypad *keypad = platform_get_drvdata(pdev); struct input_dev *input_dev = keypad->input_dev; mutex_lock(&input_dev->mutex); if (input_dev->users) samsung_keypad_stop(keypad); samsung_keypad_toggle_wakeup(keypad, true); mutex_unlock(&input_dev->mutex); return 0; } static int samsung_keypad_resume(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct samsung_keypad *keypad = platform_get_drvdata(pdev); struct input_dev *input_dev = keypad->input_dev; mutex_lock(&input_dev->mutex); samsung_keypad_toggle_wakeup(keypad, false); if (input_dev->users) samsung_keypad_start(keypad); mutex_unlock(&input_dev->mutex); return 0; } static const struct dev_pm_ops samsung_keypad_pm_ops = { .suspend = samsung_keypad_suspend, .resume = samsung_keypad_resume, }; #endif static struct platform_device_id samsung_keypad_driver_ids[] = { { .name = "samsung-keypad", .driver_data = KEYPAD_TYPE_SAMSUNG, }, { .name = "s5pv210-keypad", .driver_data = KEYPAD_TYPE_S5PV210, }, { }, }; MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids); static struct platform_driver samsung_keypad_driver = { .probe = samsung_keypad_probe, .remove = __devexit_p(samsung_keypad_remove), .driver = { .name = "samsung-keypad", .owner = THIS_MODULE, #ifdef CONFIG_PM .pm = &samsung_keypad_pm_ops, #endif }, .id_table = samsung_keypad_driver_ids, }; static int __init samsung_keypad_init(void) { printk("<0>adc_drv_open and adc_init()\n"); return platform_driver_register(&samsung_keypad_driver); } module_init(samsung_keypad_init); static void __exit samsung_keypad_exit(void) { platform_driver_unregister(&samsung_keypad_driver); } module_exit(samsung_keypad_exit); MODULE_AUTHOR("Joonyoung Shim <[email protected]>"); MODULE_AUTHOR("Donghwa Lee <[email protected]>"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:samsung-keypad");
应用程序：
key.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/select.h>
#include <sys/time.h>
#include <errno.h>
#include <linux/input.h>
int main(void)
{
int fd;
int key_value,i=0,count;
struct input_event ev_key;
fd = open("/dev/input/event2", 666);
if (fd < 0)
{
perror("open device buttons");
exit(1);
}
for (;;)
{
count = read(fd,&ev_key,sizeof(struct input_event));
for(i=0; i<(int)count/sizeof(struct input_event); i++)
if(EV_KEY==ev_key.type)
printf("type:%d,code:%c,value:%d\n", ev_key.type,ev_key.code,ev_key.value);
// if(EV_SYN==ev_key.type)
// printf("syn event\n\n");
}
close(fd);
return 0;
}
Makefile:
ifneq ($(KERNELRELEASE),) obj-m := samsung-keypad.o else KDIR := /home/ok6410/linux2.6.36/linux-2.6.36.2-v1.05 all: make -C $(KDIR) M=$(PWD) ARCH=arm CROSS_COMPILE=arm-linux- clean: rm -f *.ko *.o *.mod.o *.mod.c *.symvers endif